Can you think of any three-dimensional shape that comprises of exactly two surfaces?

I cannot talk, but I always reply when spoken to. What am I?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

If two's company, and three's a crowd, then whats four and five ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?